1 files changed, 1288 insertions, 0 deletions

diff --git a/src/video_core/host_shaders/astc_decoder.comp b/src/video_core/host_shaders/astc_decoder.comp
new file mode 100644
index 000000000..070190a5c
--- /dev/null
+++ b/src/video_core/host_shaders/astc_decoder.comp
@@ -0,0 +1,1288 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#version 450
+
+#ifdef VULKAN
+
+#define BEGIN_PUSH_CONSTANTS layout(push_constant) uniform PushConstants {
+#define END_PUSH_CONSTANTS };
+#define UNIFORM(n)
+#define BINDING_SWIZZLE_BUFFER 0
+#define BINDING_INPUT_BUFFER 1
+#define BINDING_ENC_BUFFER 2
+#define BINDING_6_TO_8_BUFFER 3
+#define BINDING_7_TO_8_BUFFER 4
+#define BINDING_8_TO_8_BUFFER 5
+#define BINDING_BYTE_TO_16_BUFFER 6
+#define BINDING_OUTPUT_IMAGE 3
+
+#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv
+
+#define BEGIN_PUSH_CONSTANTS
+#define END_PUSH_CONSTANTS
+#define UNIFORM(n) layout(location = n) uniform
+#define BINDING_SWIZZLE_BUFFER 0
+#define BINDING_INPUT_BUFFER 1
+#define BINDING_ENC_BUFFER 2
+#define BINDING_6_TO_8_BUFFER 3
+#define BINDING_7_TO_8_BUFFER 4
+#define BINDING_8_TO_8_BUFFER 5
+#define BINDING_BYTE_TO_16_BUFFER 6
+#define BINDING_OUTPUT_IMAGE 0
+
+#endif
+
+layout(local_size_x = 32, local_size_y = 32, local_size_z = 1) in;
+
+BEGIN_PUSH_CONSTANTS
+UNIFORM(0) uvec2 num_image_blocks;
+UNIFORM(1) uvec2 block_dims;
+UNIFORM(2) uint layer;
+
+UNIFORM(3) uvec3 origin;
+UNIFORM(4) ivec3 destination;
+UNIFORM(5) uint bytes_per_block_log2;
+UNIFORM(6) uint layer_stride;
+UNIFORM(7) uint block_size;
+UNIFORM(8) uint x_shift;
+UNIFORM(9) uint block_height;
+UNIFORM(10) uint block_height_mask;
+
+END_PUSH_CONSTANTS
+
+uint current_index = 0;
+int bitsread = 0;
+uint total_bitsread = 0;
+uint local_buff[16];
+
+const int JustBits = 0;
+const int Quint = 1;
+const int Trit = 2;
+
+struct EncodingData {
+    uint encoding;
+    uint num_bits;
+    uint bit_value;
+    uint quint_trit_value;
+};
+
+struct TexelWeightParams {
+    uvec2 size;
+    bool dual_plane;
+    uint max_weight;
+    bool Error;
+    bool VoidExtentLDR;
+    bool VoidExtentHDR;
+};
+
+// Swizzle data
+layout(binding = BINDING_SWIZZLE_BUFFER, std430) readonly buffer SwizzleTable {
+    uint swizzle_table[];
+};
+
+layout(binding = BINDING_INPUT_BUFFER, std430) buffer InputBufferU32 {
+    uint astc_data[];
+};
+layout(binding = BINDING_OUTPUT_IMAGE) uniform writeonly image2D dest_image;
+
+const uint GOB_SIZE_X = 64;
+const uint GOB_SIZE_Y = 8;
+const uint GOB_SIZE_Z = 1;
+const uint GOB_SIZE = GOB_SIZE_X * GOB_SIZE_Y * GOB_SIZE_Z;
+
+const uint GOB_SIZE_X_SHIFT = 6;
+const uint GOB_SIZE_Y_SHIFT = 3;
+const uint GOB_SIZE_Z_SHIFT = 0;
+const uint GOB_SIZE_SHIFT = GOB_SIZE_X_SHIFT + GOB_SIZE_Y_SHIFT + GOB_SIZE_Z_SHIFT;
+
+const uvec2 SWIZZLE_MASK = uvec2(GOB_SIZE_X - 1, GOB_SIZE_Y - 1);
+
+uint SwizzleOffset(uvec2 pos) {
+    pos = pos & SWIZZLE_MASK;
+    return swizzle_table[pos.y * 64 + pos.x];
+}
+
+uint ReadTexel(uint offset) {
+    // extract the 8-bit value from the 32-bit packed data.
+    return bitfieldExtract(astc_data[offset / 4], int((offset * 8) & 24), 8);
+}
+
+// ASTC Encodings data
+layout(binding = BINDING_ENC_BUFFER, std430) readonly buffer EncodingsValues {
+    EncodingData encoding_values[256];
+};
+// ASTC Precompiled tables
+layout(binding = BINDING_6_TO_8_BUFFER, std430) readonly buffer REPLICATE_6_BIT_TO_8 {
+    uint REPLICATE_6_BIT_TO_8_TABLE[];
+};
+layout(binding = BINDING_7_TO_8_BUFFER, std430) readonly buffer REPLICATE_7_BIT_TO_8 {
+    uint REPLICATE_7_BIT_TO_8_TABLE[];
+};
+layout(binding = BINDING_8_TO_8_BUFFER, std430) readonly buffer REPLICATE_8_BIT_TO_8 {
+    uint REPLICATE_8_BIT_TO_8_TABLE[];
+};
+layout(binding = BINDING_BYTE_TO_16_BUFFER, std430) readonly buffer REPLICATE_BYTE_TO_16 {
+    uint REPLICATE_BYTE_TO_16_TABLE[];
+};
+
+const int BLOCK_SIZE_IN_BYTES = 16;
+
+const int BLOCK_INFO_ERROR = 0;
+const int BLOCK_INFO_VOID_EXTENT_HDR = 1;
+const int BLOCK_INFO_VOID_EXTENT_LDR = 2;
+const int BLOCK_INFO_NORMAL = 3;
+
+// Replicates low numBits such that [(toBit - 1):(toBit - 1 - fromBit)]
+// is the same as [(numBits - 1):0] and repeats all the way down.
+uint Replicate(uint val, uint num_bits, uint to_bit) {
+    if (num_bits == 0) {
+        return 0;
+    }
+    if (to_bit == 0) {
+        return 0;
+    }
+    const uint v = val & uint((1 << num_bits) - 1);
+    uint res = v;
+    uint reslen = num_bits;
+    while (reslen < to_bit) {
+        uint comp = 0;
+        if (num_bits > to_bit - reslen) {
+            uint newshift = to_bit - reslen;
+            comp = num_bits - newshift;
+            num_bits = newshift;
+        }
+        res = uint(res << num_bits);
+        res = uint(res | (v >> comp));
+        reslen += num_bits;
+    }
+    return res;
+}
+
+uvec4 ReplicateByteTo16(uvec4 value) {
+    return uvec4(REPLICATE_BYTE_TO_16_TABLE[value.x], REPLICATE_BYTE_TO_16_TABLE[value.y],
+                 REPLICATE_BYTE_TO_16_TABLE[value.z], REPLICATE_BYTE_TO_16_TABLE[value.w]);
+}
+
+const uint REPLICATE_BIT_TO_7_TABLE[2] = uint[](0, 127);
+uint ReplicateBitTo7(uint value) {
+    return REPLICATE_BIT_TO_7_TABLE[value];
+    ;
+}
+
+const uint REPLICATE_1_BIT_TO_9_TABLE[2] = uint[](0, 511);
+uint ReplicateBitTo9(uint value) {
+    return REPLICATE_1_BIT_TO_9_TABLE[value];
+}
+
+const uint REPLICATE_1_BIT_TO_8_TABLE[2] = uint[](0, 255);
+const uint REPLICATE_2_BIT_TO_8_TABLE[4] = uint[](0, 85, 170, 255);
+const uint REPLICATE_3_BIT_TO_8_TABLE[8] = uint[](0, 36, 73, 109, 146, 182, 219, 255);
+const uint REPLICATE_4_BIT_TO_8_TABLE[16] =
+    uint[](0, 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255);
+const uint REPLICATE_5_BIT_TO_8_TABLE[32] =
+    uint[](0, 8, 16, 24, 33, 41, 49, 57, 66, 74, 82, 90, 99, 107, 115, 123, 132, 140, 148, 156, 165,
+           173, 181, 189, 198, 206, 214, 222, 231, 239, 247, 255);
+
+uint FastReplicateTo8(uint value, uint num_bits) {
+    switch (num_bits) {
+    case 1:
+        return REPLICATE_1_BIT_TO_8_TABLE[value];
+    case 2:
+        return REPLICATE_2_BIT_TO_8_TABLE[value];
+    case 3:
+        return REPLICATE_3_BIT_TO_8_TABLE[value];
+    case 4:
+        return REPLICATE_4_BIT_TO_8_TABLE[value];
+    case 5:
+        return REPLICATE_5_BIT_TO_8_TABLE[value];
+    case 6:
+        return REPLICATE_6_BIT_TO_8_TABLE[value];
+    case 7:
+        return REPLICATE_7_BIT_TO_8_TABLE[value];
+    case 8:
+        return REPLICATE_8_BIT_TO_8_TABLE[value];
+    }
+    return Replicate(value, num_bits, 8);
+}
+
+const uint REPLICATE_1_BIT_TO_6_TABLE[2] = uint[](0, 63);
+const uint REPLICATE_2_BIT_TO_6_TABLE[4] = uint[](0, 21, 42, 63);
+const uint REPLICATE_3_BIT_TO_6_TABLE[8] = uint[](0, 9, 18, 27, 36, 45, 54, 63);
+const uint REPLICATE_4_BIT_TO_6_TABLE[16] =
+    uint[](0, 4, 8, 12, 17, 21, 25, 29, 34, 38, 42, 46, 51, 55, 59, 63);
+const uint REPLICATE_5_BIT_TO_6_TABLE[32] =
+    uint[](0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 33, 35, 37, 39, 41, 43, 45,
+           47, 49, 51, 53, 55, 57, 59, 61, 63);
+
+uint FastReplicateTo6(uint value, uint num_bits) {
+    switch (num_bits) {
+    case 1:
+        return REPLICATE_1_BIT_TO_6_TABLE[value];
+    case 2:
+        return REPLICATE_2_BIT_TO_6_TABLE[value];
+    case 3:
+        return REPLICATE_3_BIT_TO_6_TABLE[value];
+    case 4:
+        return REPLICATE_4_BIT_TO_6_TABLE[value];
+    case 5:
+        return REPLICATE_5_BIT_TO_6_TABLE[value];
+    }
+    return Replicate(value, num_bits, 6);
+}
+
+uint hash52(uint p) {
+    p ^= p >> 15;
+    p -= p << 17;
+    p += p << 7;
+    p += p << 4;
+    p ^= p >> 5;
+    p += p << 16;
+    p ^= p >> 7;
+    p ^= p >> 3;
+    p ^= p << 6;
+    p ^= p >> 17;
+    return p;
+}
+
+uint SelectPartition(uint seed, uint x, uint y, uint z, uint partition_count, bool small_block) {
+    if (1 == partition_count)
+        return 0;
+
+    if (small_block) {
+        x <<= 1;
+        y <<= 1;
+        z <<= 1;
+    }
+
+    seed += (partition_count - 1) * 1024;
+
+    uint rnum = hash52(uint(seed));
+    uint seed1 = uint(rnum & 0xF);
+    uint seed2 = uint((rnum >> 4) & 0xF);
+    uint seed3 = uint((rnum >> 8) & 0xF);
+    uint seed4 = uint((rnum >> 12) & 0xF);
+    uint seed5 = uint((rnum >> 16) & 0xF);
+    uint seed6 = uint((rnum >> 20) & 0xF);
+    uint seed7 = uint((rnum >> 24) & 0xF);
+    uint seed8 = uint((rnum >> 28) & 0xF);
+    uint seed9 = uint((rnum >> 18) & 0xF);
+    uint seed10 = uint((rnum >> 22) & 0xF);
+    uint seed11 = uint((rnum >> 26) & 0xF);
+    uint seed12 = uint(((rnum >> 30) | (rnum << 2)) & 0xF);
+
+    seed1 = (seed1 * seed1);
+    seed2 = (seed2 * seed2);
+    seed3 = (seed3 * seed3);
+    seed4 = (seed4 * seed4);
+    seed5 = (seed5 * seed5);
+    seed6 = (seed6 * seed6);
+    seed7 = (seed7 * seed7);
+    seed8 = (seed8 * seed8);
+    seed9 = (seed9 * seed9);
+    seed10 = (seed10 * seed10);
+    seed11 = (seed11 * seed11);
+    seed12 = (seed12 * seed12);
+
+    int sh1, sh2, sh3;
+    if ((seed & 1) > 0) {
+        sh1 = (seed & 2) > 0 ? 4 : 5;
+        sh2 = (partition_count == 3) ? 6 : 5;
+    } else {
+        sh1 = (partition_count == 3) ? 6 : 5;
+        sh2 = (seed & 2) > 0 ? 4 : 5;
+    }
+    sh3 = (seed & 0x10) > 0 ? sh1 : sh2;
+
+    seed1 = (seed1 >> sh1);
+    seed2 = (seed2 >> sh2);
+    seed3 = (seed3 >> sh1);
+    seed4 = (seed4 >> sh2);
+    seed5 = (seed5 >> sh1);
+    seed6 = (seed6 >> sh2);
+    seed7 = (seed7 >> sh1);
+    seed8 = (seed8 >> sh2);
+    seed9 = (seed9 >> sh3);
+    seed10 = (seed10 >> sh3);
+    seed11 = (seed11 >> sh3);
+    seed12 = (seed12 >> sh3);
+
+    uint a = seed1 * x + seed2 * y + seed11 * z + (rnum >> 14);
+    uint b = seed3 * x + seed4 * y + seed12 * z + (rnum >> 10);
+    uint c = seed5 * x + seed6 * y + seed9 * z + (rnum >> 6);
+    uint d = seed7 * x + seed8 * y + seed10 * z + (rnum >> 2);
+
+    a &= 0x3F;
+    b &= 0x3F;
+    c &= 0x3F;
+    d &= 0x3F;
+
+    if (partition_count < 4)
+        d = 0;
+    if (partition_count < 3)
+        c = 0;
+
+    if (a >= b && a >= c && a >= d)
+        return 0;
+    else if (b >= c && b >= d)
+        return 1;
+    else if (c >= d)
+        return 2;
+    return 3;
+}
+
+uint Select2DPartition(uint seed, uint x, uint y, uint partition_count, bool small_block) {
+    return SelectPartition(seed, x, y, 0, partition_count, small_block);
+}
+
+uint ReadBit() {
+    uint bit = bitfieldExtract(local_buff[current_index], bitsread, 1);
+    bitsread++;
+    total_bitsread++;
+    if (bitsread == 8) {
+        current_index++;
+        bitsread = 0;
+    }
+    return bit;
+}
+
+uint StreamBits(uint num_bits) {
+    uint ret = 0;
+    for (uint i = 0; i < num_bits; i++) {
+        ret |= ((ReadBit() & 1) << i);
+    }
+    return ret;
+}
+
+// Define color data.
+uint color_endpoint_data[16];
+int color_bitsread = 0;
+uint total_color_bitsread = 0;
+int color_index = 0;
+
+// Define color data.
+uint texel_weight_data[16];
+int texel_bitsread = 0;
+uint total_texel_bitsread = 0;
+int texel_index = 0;
+
+bool texel_flag = false;
+
+uint ReadColorBit() {
+    uint bit = 0;
+    if (texel_flag) {
+        bit = bitfieldExtract(texel_weight_data[texel_index], texel_bitsread, 1);
+        texel_bitsread++;
+        total_texel_bitsread++;
+        if (texel_bitsread == 8) {
+            texel_index++;
+            texel_bitsread = 0;
+        }
+    } else {
+        bit = bitfieldExtract(color_endpoint_data[color_index], color_bitsread, 1);
+        color_bitsread++;
+        total_color_bitsread++;
+        if (color_bitsread == 8) {
+            color_index++;
+            color_bitsread = 0;
+        }
+    }
+    return bit;
+}
+
+uint StreamColorBits(uint num_bits) {
+    uint ret = 0;
+    for (uint i = 0; i < num_bits; i++) {
+        ret |= ((ReadColorBit() & 1) << i);
+    }
+    return ret;
+}
+
+EncodingData result_vector[100];
+int result_index = 0;
+
+EncodingData texel_vector[100];
+int texel_vector_index = 0;
+
+void ResultEmplaceBack(EncodingData val) {
+    if (texel_flag) {
+        texel_vector[texel_vector_index] = val;
+        texel_vector_index++;
+    } else {
+        result_vector[result_index] = val;
+        result_index++;
+    }
+}
+
+// Returns the number of bits required to encode n_vals values.
+uint GetBitLength(uint n_vals, uint encoding_index) {
+    uint totalBits = encoding_values[encoding_index].num_bits * n_vals;
+    if (encoding_values[encoding_index].encoding == Trit) {
+        totalBits += (n_vals * 8 + 4) / 5;
+    } else if (encoding_values[encoding_index].encoding == Quint) {
+        totalBits += (n_vals * 7 + 2) / 3;
+    }
+    return totalBits;
+}
+
+uint GetNumWeightValues(uvec2 size, bool dual_plane) {
+    uint n_vals = size.x * size.y;
+    if (dual_plane) {
+        n_vals *= 2;
+    }
+    return n_vals;
+}
+
+uint GetPackedBitSize(uvec2 size, bool dual_plane, uint max_weight) {
+    uint n_vals = GetNumWeightValues(size, dual_plane);
+    return GetBitLength(n_vals, max_weight);
+}
+
+uint BitsBracket(uint bits, uint pos) {
+    return ((bits >> pos) & 1);
+}
+
+uint BitsOp(uint bits, uint start, uint end) {
+    if (start == end) {
+        return BitsBracket(bits, start);
+    } else if (start > end) {
+        uint t = start;
+        start = end;
+        end = t;
+    }
+
+    uint mask = (1 << (end - start + 1)) - 1;
+    return ((bits >> start) & mask);
+}
+
+void DecodeQuintBlock(uint num_bits) { // Value number of bits
+    uint m[3];
+    uint q[3];
+    uint Q;
+    m[0] = StreamColorBits(num_bits);
+    Q = StreamColorBits(3);
+    m[1] = StreamColorBits(num_bits);
+    Q |= StreamColorBits(2) << 3;
+    m[2] = StreamColorBits(num_bits);
+    Q |= StreamColorBits(2) << 5;
+    if (BitsOp(Q, 1, 2) == 3 && BitsOp(Q, 5, 6) == 0) {
+        q[0] = 4;
+        q[1] = 4;
+        q[2] = (BitsBracket(Q, 0) << 2) | ((BitsBracket(Q, 4) & ~BitsBracket(Q, 0)) << 1) |
+               (BitsBracket(Q, 3) & ~BitsBracket(Q, 0));
+    } else {
+        uint C = 0;
+        if (BitsOp(Q, 1, 2) == 3) {
+            q[2] = 4;
+            C = (BitsOp(Q, 3, 4) << 3) | ((~BitsOp(Q, 5, 6) & 3) << 1) | BitsBracket(Q, 0);
+        } else {
+            q[2] = BitsOp(Q, 5, 6);
+            C = BitsOp(Q, 0, 4);
+        }
+
+        if (BitsOp(C, 0, 2) == 5) {
+            q[1] = 4;
+            q[0] = BitsOp(C, 3, 4);
+        } else {
+            q[1] = BitsOp(C, 3, 4);
+            q[0] = BitsOp(C, 0, 2);
+        }
+    }
+
+    for (uint i = 0; i < 3; i++) {
+        EncodingData val;
+        val.encoding = Quint;
+        val.num_bits = num_bits;
+        val.bit_value = m[i];
+        val.quint_trit_value = q[i];
+        ResultEmplaceBack(val);
+    }
+}
+
+void DecodeTritBlock(uint num_bits) {
+    uint m[5];
+    uint t[5];
+    uint T;
+    m[0] = StreamColorBits(num_bits);
+    T = StreamColorBits(2);
+    m[1] = StreamColorBits(num_bits);
+    T |= StreamColorBits(2) << 2;
+    m[2] = StreamColorBits(num_bits);
+    T |= StreamColorBits(1) << 4;
+    m[3] = StreamColorBits(num_bits);
+    T |= StreamColorBits(2) << 5;
+    m[4] = StreamColorBits(num_bits);
+    T |= StreamColorBits(1) << 7;
+    uint C = 0;
+    if (BitsOp(T, 2, 4) == 7) {
+        C = (BitsOp(T, 5, 7) << 2) | BitsOp(T, 0, 1);
+        t[4] = 2;
+        t[3] = 2;
+    } else {
+        C = BitsOp(T, 0, 4);
+        if (BitsOp(T, 5, 6) == 3) {
+            t[4] = 2;
+            t[3] = BitsBracket(T, 7);
+        } else {
+            t[4] = BitsBracket(T, 7);
+            t[3] = BitsOp(T, 5, 6);
+        }
+    }
+    if (BitsOp(C, 0, 1) == 3) {
+        t[2] = 2;
+        t[1] = BitsBracket(C, 4);
+        t[0] = (BitsBracket(C, 3) << 1) | (BitsBracket(C, 2) & ~BitsBracket(C, 3));
+    } else if (BitsOp(C, 2, 3) == 3) {
+        t[2] = 2;
+        t[1] = 2;
+        t[0] = BitsOp(C, 0, 1);
+    } else {
+        t[2] = BitsBracket(C, 4);
+        t[1] = BitsOp(C, 2, 3);
+        t[0] = (BitsBracket(C, 1) << 1) | (BitsBracket(C, 0) & ~BitsBracket(C, 1));
+    }
+    for (uint i = 0; i < 5; i++) {
+        EncodingData val;
+        val.encoding = Trit;
+        val.num_bits = num_bits;
+        val.bit_value = m[i];
+        val.quint_trit_value = t[i];
+        ResultEmplaceBack(val);
+    }
+}
+void DecodeIntegerSequence(uint max_range, uint num_values) {
+    EncodingData val = encoding_values[max_range];
+    uint vals_decoded = 0;
+    while (vals_decoded < num_values) {
+        switch (val.encoding) {
+        case Quint:
+            DecodeQuintBlock(val.num_bits);
+            vals_decoded += 3;
+            break;
+
+        case Trit:
+            DecodeTritBlock(val.num_bits);
+            vals_decoded += 5;
+            break;
+
+        case JustBits:
+            val.bit_value = StreamColorBits(val.num_bits);
+            ResultEmplaceBack(val);
+            vals_decoded++;
+            break;
+        }
+    }
+}
+
+void DecodeColorValues(out uint color_values[32], uvec4 modes, uint num_partitions,
+                       uint color_data_bits) {
+    uint num_values = 0;
+    for (uint i = 0; i < num_partitions; i++) {
+        num_values += ((modes[i] >> 2) + 1) << 1;
+    }
+    int range = 256;
+    while (--range > 0) {
+        EncodingData val = encoding_values[range];
+        uint bitLength = GetBitLength(num_values, range);
+        if (bitLength <= color_data_bits) {
+            while (--range > 0) {
+                EncodingData newval = encoding_values[range];
+                if (newval.encoding != val.encoding && newval.num_bits != val.num_bits) {
+                    break;
+                }
+            }
+            range++;
+            break;
+        }
+    }
+    DecodeIntegerSequence(range, num_values);
+    uint out_index = 0;
+    for (int itr = 0; itr < result_index; itr++) {
+        if (out_index >= num_values) {
+            break;
+        }
+        EncodingData val = result_vector[itr];
+        uint bitlen = val.num_bits;
+        uint bitval = val.bit_value;
+        uint A = 0, B = 0, C = 0, D = 0;
+        A = ReplicateBitTo9((bitval & 1));
+        switch (val.encoding) {
+        case JustBits:
+            color_values[out_index++] = FastReplicateTo8(bitval, bitlen);
+            break;
+        case Trit: {
+            D = val.quint_trit_value;
+            switch (bitlen) {
+            case 1: {
+                C = 204;
+            } break;
+            case 2: {
+                C = 93;
+                uint b = (bitval >> 1) & 1;
+                B = (b << 8) | (b << 4) | (b << 2) | (b << 1);
+            } break;
+
+            case 3: {
+                C = 44;
+                uint cb = (bitval >> 1) & 3;
+                B = (cb << 7) | (cb << 2) | cb;
+            } break;
+
+            case 4: {
+                C = 22;
+                uint dcb = (bitval >> 1) & 7;
+                B = (dcb << 6) | dcb;
+            } break;
+
+            case 5: {
+                C = 11;
+                uint edcb = (bitval >> 1) & 0xF;
+                B = (edcb << 5) | (edcb >> 2);
+            } break;
+
+            case 6: {
+                C = 5;
+                uint fedcb = (bitval >> 1) & 0x1F;
+                B = (fedcb << 4) | (fedcb >> 4);
+            } break;
+            }
+        } break;
+        case Quint: {
+            D = val.quint_trit_value;
+            switch (bitlen) {
+            case 1: {
+                C = 113;
+            } break;
+            case 2: {
+                C = 54;
+                uint b = (bitval >> 1) & 1;
+                B = (b << 8) | (b << 3) | (b << 2);
+            } break;
+            case 3: {
+                C = 26;
+                uint cb = (bitval >> 1) & 3;
+                B = (cb << 7) | (cb << 1) | (cb >> 1);
+            } break;
+            case 4: {
+                C = 13;
+                uint dcb = (bitval >> 1) & 7;
+                B = (dcb << 6) | (dcb >> 1);
+            } break;
+            case 5: {
+                C = 6;
+                uint edcb = (bitval >> 1) & 0xF;
+                B = (edcb << 5) | (edcb >> 3);
+            } break;
+            }
+        } break;
+        }
+
+        if (val.encoding != JustBits) {
+            uint T = (D * C) + B;
+            T ^= A;
+            T = (A & 0x80) | (T >> 2);
+            color_values[out_index++] = T;
+        }
+    }
+}
+ivec2 BitTransferSigned(int a, int b) {
+    ivec2 transferred;
+    transferred[1] = b >> 1;
+    transferred[1] |= a & 0x80;
+    transferred[0] = a >> 1;
+    transferred[0] &= 0x3F;
+    if ((transferred[0] & 0x20) > 0) {
+        transferred[0] -= 0x40;
+    }
+    return transferred;
+}
+
+uvec4 ClampByte(ivec4 color) {
+    for (uint i = 0; i < 4; i++) {
+        color[i] = (color[i] < 0) ? 0 : ((color[i] > 255) ? 255 : color[i]);
+    }
+    return uvec4(color);
+}
+ivec4 BlueContract(int a, int r, int g, int b) {
+    return ivec4(a, (r + b) >> 1, (g + b) >> 1, b);
+}
+int colvals_index = 0;
+void ComputeEndpoints(out uvec4 ep1, out uvec4 ep2, uint color_values[32],
+                      uint color_endpoint_mode) {
+#define READ_UINT_VALUES(N)                                                                        \
+    uint v[N];                                                                                     \
+    for (uint i = 0; i < N; i++) {                                                                 \
+        v[i] = color_values[colvals_index++];                                                      \
+    }
+
+#define READ_INT_VALUES(N)                                                                         \
+    int v[N];                                                                                      \
+    for (uint i = 0; i < N; i++) {                                                                 \
+        v[i] = int(color_values[colvals_index++]);                                                 \
+    }
+
+    switch (color_endpoint_mode) {
+    case 0: {
+        READ_UINT_VALUES(2)
+        ep1 = uvec4(0xFF, v[0], v[0], v[0]);
+        ep2 = uvec4(0xFF, v[1], v[1], v[1]);
+    } break;
+
+    case 1: {
+        READ_UINT_VALUES(2)
+        uint L0 = (v[0] >> 2) | (v[1] & 0xC0);
+        uint L1 = max(L0 + (v[1] & 0x3F), 0xFFU);
+        ep1 = uvec4(0xFF, L0, L0, L0);
+        ep2 = uvec4(0xFF, L1, L1, L1);
+    } break;
+
+    case 4: {
+        READ_UINT_VALUES(4)
+        ep1 = uvec4(v[2], v[0], v[0], v[0]);
+        ep2 = uvec4(v[3], v[1], v[1], v[1]);
+    } break;
+
+    case 5: {
+        READ_INT_VALUES(4)
+        ivec2 transferred = BitTransferSigned(v[1], v[0]);
+        v[1] = transferred[0];
+        v[0] = transferred[1];
+        transferred = BitTransferSigned(v[3], v[2]);
+        v[3] = transferred[0];
+        v[2] = transferred[1];
+        ep1 = ClampByte(ivec4(v[2], v[0], v[0], v[0]));
+        ep2 = ClampByte(ivec4((v[2] + v[3]), v[0] + v[1], v[0] + v[1], v[0] + v[1]));
+    } break;
+
+    case 6: {
+        READ_UINT_VALUES(4)
+        ep1 = uvec4(0xFF, v[0] * v[3] >> 8, v[1] * v[3] >> 8, v[2] * v[3] >> 8);
+        ep2 = uvec4(0xFF, v[0], v[1], v[2]);
+    } break;
+
+    case 8: {
+        READ_UINT_VALUES(6)
+        if (v[1] + v[3] + v[5] >= v[0] + v[2] + v[4]) {
+            ep1 = uvec4(0xFF, v[0], v[2], v[4]);
+            ep2 = uvec4(0xFF, v[1], v[3], v[5]);
+        } else {
+            ep1 = uvec4(BlueContract(0xFF, int(v[1]), int(v[3]), int(v[5])));
+            ep2 = uvec4(BlueContract(0xFF, int(v[0]), int(v[2]), int(v[4])));
+        }
+    } break;
+
+    case 9: {
+        READ_INT_VALUES(6)
+        ivec2 transferred = BitTransferSigned(v[1], v[0]);
+        v[1] = transferred[0];
+        v[0] = transferred[1];
+        transferred = BitTransferSigned(v[3], v[2]);
+        v[3] = transferred[0];
+        v[2] = transferred[1];
+        transferred = BitTransferSigned(v[5], v[4]);
+        v[5] = transferred[0];
+        v[4] = transferred[1];
+        if (v[1] + v[3] + v[5] >= 0) {
+            ep1 = ClampByte(ivec4(0xFF, v[0], v[2], v[4]));
+            ep2 = ClampByte(ivec4(0xFF, v[0] + v[1], v[2] + v[3], v[4] + v[5]));
+        } else {
+            ep1 = ClampByte(BlueContract(0xFF, v[0] + v[1], v[2] + v[3], v[4] + v[5]));
+            ep2 = ClampByte(BlueContract(0xFF, v[0], v[2], v[4]));
+        }
+    } break;
+
+    case 10: {
+        READ_UINT_VALUES(6)
+        ep1 = uvec4(v[4], v[0] * v[3] >> 8, v[1] * v[3] >> 8, v[2] * v[3] >> 8);
+        ep2 = uvec4(v[5], v[0], v[1], v[2]);
+    } break;
+
+    case 12: {
+        READ_UINT_VALUES(8)
+        if (v[1] + v[3] + v[5] >= v[0] + v[2] + v[4]) {
+            ep1 = uvec4(v[6], v[0], v[2], v[4]);
+            ep2 = uvec4(v[7], v[1], v[3], v[5]);
+        } else {
+            ep1 = uvec4(BlueContract(int(v[7]), int(v[1]), int(v[3]), int(v[5])));
+            ep2 = uvec4(BlueContract(int(v[6]), int(v[0]), int(v[2]), int(v[4])));
+        }
+    } break;
+
+    case 13: {
+        READ_INT_VALUES(8)
+        ivec2 transferred = BitTransferSigned(v[1], v[0]);
+        v[1] = transferred[0];
+        v[0] = transferred[1];
+        transferred = BitTransferSigned(v[3], v[2]);
+        v[3] = transferred[0];
+        v[2] = transferred[1];
+
+        transferred = BitTransferSigned(v[5], v[4]);
+        v[5] = transferred[0];
+        v[4] = transferred[1];
+
+        transferred = BitTransferSigned(v[7], v[6]);
+        v[7] = transferred[0];
+        v[6] = transferred[1];
+
+        if (v[1] + v[3] + v[5] >= 0) {
+            ep1 = ClampByte(ivec4(v[6], v[0], v[2], v[4]));
+            ep2 = ClampByte(ivec4(v[7] + v[6], v[0] + v[1], v[2] + v[3], v[4] + v[5]));
+        } else {
+            ep1 = ClampByte(BlueContract(v[6] + v[7], v[0] + v[1], v[2] + v[3], v[4] + v[5]));
+            ep2 = ClampByte(BlueContract(v[6], v[0], v[2], v[4]));
+        }
+    } break;
+    }
+#undef READ_UINT_VALUES
+#undef READ_INT_VALUES
+}
+
+uint UnquantizeTexelWeight(EncodingData val) {
+    uint bitval = val.bit_value;
+    uint bitlen = val.num_bits;
+    uint A = ReplicateBitTo7((bitval & 1));
+    uint B = 0, C = 0, D = 0;
+    uint result = 0;
+    switch (val.encoding) {
+    case JustBits:
+        result = FastReplicateTo6(bitval, bitlen);
+        break;
+    case Trit: {
+        D = val.quint_trit_value;
+        switch (bitlen) {
+        case 0: {
+            uint results[3] = {0, 32, 63};
+            result = results[D];
+        } break;
+        case 1: {
+            C = 50;
+        } break;
+        case 2: {
+            C = 23;
+            uint b = (bitval >> 1) & 1;
+            B = (b << 6) | (b << 2) | b;
+        } break;
+        case 3: {
+            C = 11;
+            uint cb = (bitval >> 1) & 3;
+            B = (cb << 5) | cb;
+        } break;
+        default:
+            break;
+        }
+    } break;
+    case Quint: {
+        D = val.quint_trit_value;
+        switch (bitlen) {
+        case 0: {
+            uint results[5] = {0, 16, 32, 47, 63};
+            result = results[D];
+        } break;
+        case 1: {
+            C = 28;
+        } break;
+        case 2: {
+            C = 13;
+            uint b = (bitval >> 1) & 1;
+            B = (b << 6) | (b << 1);
+        } break;
+        }
+    } break;
+    }
+    if (val.encoding != JustBits && bitlen > 0) {
+        result = D * C + B;
+        result ^= A;
+        result = (A & 0x20) | (result >> 2);
+    }
+    if (result > 32) {
+        result += 1;
+    }
+    return result;
+}
+
+void UnquantizeTexelWeights(out uint outbuffer[2][144], bool dual_plane, uvec2 size) {
+    uint weight_idx = 0;
+    uint unquantized[2][144];
+    uint area = size.x * size.y;
+    for (uint itr = 0; itr < texel_vector_index; itr++) {
+        unquantized[0][weight_idx] = UnquantizeTexelWeight(texel_vector[itr]);
+        if (dual_plane) {
+            ++itr;
+            unquantized[1][weight_idx] = UnquantizeTexelWeight(texel_vector[itr]);
+            if (itr == texel_vector_index) {
+                break;
+            }
+        }
+        if (++weight_idx >= (area))
+            break;
+    }
+    uint Ds = uint((block_dims.x * 0.5f + 1024) / (block_dims.x - 1));
+    uint Dt = uint((block_dims.y * 0.5f + 1024) / (block_dims.y - 1));
+    uint kPlaneScale = dual_plane ? 2 : 1;
+    for (uint plane = 0; plane < kPlaneScale; plane++)
+        for (uint t = 0; t < block_dims.y; t++)
+            for (uint s = 0; s < block_dims.x; s++) {
+                uint cs = Ds * s;
+                uint ct = Dt * t;
+                uint gs = (cs * (size.x - 1) + 32) >> 6;
+                uint gt = (ct * (size.y - 1) + 32) >> 6;
+                uint js = gs >> 4;
+                uint fs = gs & 0xF;
+                uint jt = gt >> 4;
+                uint ft = gt & 0x0F;
+                uint w11 = (fs * ft + 8) >> 4;
+                uint w10 = ft - w11;
+                uint w01 = fs - w11;
+                uint w00 = 16 - fs - ft + w11;
+                uvec4 w = uvec4(w00, w01, w10, w11);
+                uint v0 = jt * size.x + js;
+
+                uvec4 p = uvec4(0);
+                if (v0 < area) {
+                    p.x = unquantized[plane][v0];
+                }
+                if ((v0 + 1) < (area)) {
+                    p.y = unquantized[plane][v0 + 1];
+                }
+                if ((v0 + size.x) < (area)) {
+                    p.z = unquantized[plane][(v0 + size.x)];
+                }
+                if ((v0 + size.x + 1) < (area)) {
+                    p.w = unquantized[plane][(v0 + size.x + 1)];
+                }
+                outbuffer[plane][t * block_dims.x + s] = (uint(dot(p, w)) + 8) >> 4;
+            }
+}
+
+int FindLayout(uint mode) {
+    if ((mode & 3) != 0) {
+        if ((mode & 8) != 0) {
+            if ((mode & 4) != 0) {
+                if ((mode & 0x100) != 0) {
+                    return 4;
+                }
+                return 3;
+            }
+            return 2;
+        }
+        if ((mode & 4) != 0) {
+            return 1;
+        }
+        return 0;
+    }
+    if ((mode & 0x100) != 0) {
+        if ((mode & 0x80) != 0) {
+            if ((mode & 0x20) != 0) {
+                return 8;
+            }
+            return 7;
+        }
+        return 9;
+    }
+    if ((mode & 0x80) != 0) {
+        return 6;
+    }
+    return 5;
+}
+
+TexelWeightParams DecodeBlockInfo(uint block_index) {
+    TexelWeightParams params = TexelWeightParams(uvec2(0), false, 0, false, false, false);
+    uint mode = StreamBits(11);
+    if ((mode & 0x1ff) == 0x1fc) {
+        if ((mode & 0x200) != 0) {
+            params.VoidExtentHDR = true;
+        } else {
+            params.VoidExtentLDR = true;
+        }
+        if ((mode & 0x400) == 0 || StreamBits(1) == 0) {
+            params.Error = true;
+        }
+        return params;
+    }
+    if ((mode & 0xf) == 0) {
+        params.Error = true;
+        return params;
+    }
+    if ((mode & 3) == 0 && (mode & 0x1c0) == 0x1c0) {
+        params.Error = true;
+        return params;
+    }
+    uint A, B;
+    uint mode_layout = FindLayout(mode);
+    switch (mode_layout) {
+    case 0:
+        A = (mode >> 5) & 0x3;
+        B = (mode >> 7) & 0x3;
+        params.size = uvec2(B + 4, A + 2);
+        break;
+    case 1:
+        A = (mode >> 5) & 0x3;
+        B = (mode >> 7) & 0x3;
+        params.size = uvec2(B + 8, A + 2);
+        break;
+    case 2:
+        A = (mode >> 5) & 0x3;
+        B = (mode >> 7) & 0x3;
+        params.size = uvec2(A + 2, B + 8);
+        break;
+    case 3:
+        A = (mode >> 5) & 0x3;
+        B = (mode >> 7) & 0x1;
+        params.size = uvec2(A + 2, B + 6);
+        break;
+    case 4:
+        A = (mode >> 5) & 0x3;
+        B = (mode >> 7) & 0x1;
+        params.size = uvec2(B + 2, A + 2);
+        break;
+    case 5:
+        A = (mode >> 5) & 0x3;
+        params.size = uvec2(12, A + 2);
+        break;
+    case 6:
+        A = (mode >> 5) & 0x3;
+        params.size = uvec2(A + 2, 12);
+        break;
+    case 7:
+        params.size = uvec2(6, 10);
+        break;
+    case 8:
+        params.size = uvec2(10, 6);
+        break;
+    case 9:
+        A = (mode >> 5) & 0x3;
+        B = (mode >> 9) & 0x3;
+        params.size = uvec2(A + 6, B + 6);
+        break;
+    default:
+        params.Error = true;
+        break;
+    }
+    params.dual_plane = (mode_layout != 9) && ((mode & 0x400) != 0);
+    uint weight_index = (mode & 0x10) != 0 ? 1 : 0;
+    if (mode_layout < 5) {
+        weight_index |= (mode & 0x3) << 1;
+    } else {
+        weight_index |= (mode & 0xc) >> 1;
+    }
+    weight_index -= 2;
+    if ((mode_layout != 9) && ((mode & 0x200) != 0)) {
+        const int max_weights[6] = int[6](9, 11, 15, 19, 23, 31);
+        params.max_weight = max_weights[weight_index];
+    } else {
+        const int max_weights[6] = int[6](1, 2, 3, 4, 5, 7);
+        params.max_weight = max_weights[weight_index];
+    }
+    return params;
+}
+
+void FillError(ivec3 coord) {
+    for (uint j = 0; j < block_dims.y; j++) {
+        for (uint i = 0; i < block_dims.x; i++) {
+            imageStore(dest_image, coord.xy + ivec2(i, j), vec4(1.0, 1.0, 0.0, 1.0));
+        }
+    }
+    return;
+}
+
+void FillVoidExtentLDR(ivec3 coord, uint block_index) {
+    for (int i = 0; i < 4; i++) {
+        StreamBits(13);
+    }
+
+    uint r_u = StreamBits(16);
+    uint g_u = StreamBits(16);
+    uint b_u = StreamBits(16);
+    uint a_u = StreamBits(16);
+    float a = float(a_u) / 65535.0f;
+    float r = float(r_u) / 65535.0f;
+    float g = float(g_u) / 65535.0f;
+    float b = float(b_u) / 65535.0f;
+    for (uint j = 0; j < block_dims.y; j++) {
+        for (uint i = 0; i < block_dims.x; i++) {
+            imageStore(dest_image, coord.xy + ivec2(i, j), vec4(r, g, b, a));
+        }
+    }
+}
+
+void DecompressBlock(ivec3 coord, uint block_index) {
+    TexelWeightParams params;
+    params = DecodeBlockInfo(block_index);
+    if (params.Error) {
+        FillError(coord);
+        return;
+    }
+    if (params.VoidExtentHDR) {
+        FillError(coord);
+        return;
+    }
+    if (params.VoidExtentLDR) {
+        FillVoidExtentLDR(coord, block_index);
+        return;
+    }
+    if (params.size.x > block_dims.x || params.size.y > block_dims.y) {
+        FillError(coord);
+        return;
+    }
+    uint num_partitions = StreamBits(2) + 1;
+    if (num_partitions > 4 || (num_partitions == 4 && params.dual_plane)) {
+        FillError(coord);
+        return;
+    }
+    int plane_index = -1;
+    uint partition_index = 1;
+    uvec4 color_endpoint_mode = uvec4(0);
+    uint ced_pointer = 0;
+    uint base_cem = 0;
+    if (num_partitions == 1) {
+        color_endpoint_mode[0] = StreamBits(4);
+        partition_index = 0;
+    } else {
+        partition_index = StreamBits(10);
+        base_cem = StreamBits(6);
+    }
+    uint base_mode = base_cem & 3;
+    uint weight_bits = GetPackedBitSize(params.size, params.dual_plane, params.max_weight);
+    uint remaining_bits = 128 - weight_bits - total_bitsread;
+    uint extra_cem_bits = 0;
+    if (base_mode > 0) {
+        switch (num_partitions) {
+        case 2:
+            extra_cem_bits += 2;
+            break;
+        case 3:
+            extra_cem_bits += 5;
+            break;
+        case 4:
+            extra_cem_bits += 8;
+            break;
+        default:
+            return;
+        }
+    }
+    remaining_bits -= extra_cem_bits;
+    uint plane_selector_bits = 0;
+    if (params.dual_plane) {
+        plane_selector_bits = 2;
+    }
+    remaining_bits -= plane_selector_bits;
+    // Read color data...
+    uint color_data_bits = remaining_bits;
+    while (remaining_bits > 0) {
+        uint nb = min(remaining_bits, 8);
+        uint b = StreamBits(nb);
+        color_endpoint_data[ced_pointer] = uint(bitfieldExtract(b, 0, 8));
+        ced_pointer++;
+        remaining_bits -= nb;
+    }
+    plane_index = int(StreamBits(plane_selector_bits));
+    if (base_mode > 0) {
+        uint extra_cem = StreamBits(extra_cem_bits);
+        uint cem = (extra_cem << 6) | base_cem;
+        cem >>= 2;
+        uint C[4] = {0, 0, 0, 0};
+        for (uint i = 0; i < num_partitions; i++) {
+            C[i] = cem & 1;
+            cem >>= 1;
+        }
+        uint M[4] = {0, 0, 0, 0};
+        for (uint i = 0; i < num_partitions; i++) {
+            M[i] = cem & 3;
+            cem >>= 2;
+        }
+        for (uint i = 0; i < num_partitions; i++) {
+            color_endpoint_mode[i] = base_mode;
+            if ((C[i]) == 0) {
+                color_endpoint_mode[i] -= 1;
+            }
+            color_endpoint_mode[i] <<= 2;
+            color_endpoint_mode[i] |= M[i];
+        }
+    } else if (num_partitions > 1) {
+        uint cem = base_cem >> 2;
+        for (uint i = 0; i < num_partitions; i++) {
+            color_endpoint_mode[i] = cem;
+        }
+    }
+
+    uint color_values[32]; // Four values, two endpoints, four maximum paritions
+    DecodeColorValues(color_values, color_endpoint_mode, num_partitions, color_data_bits);
+    uvec4 endpoints[4][2];
+    for (uint i = 0; i < num_partitions; i++) {
+        ComputeEndpoints(endpoints[i][0], endpoints[i][1], color_values, color_endpoint_mode[i]);
+    }
+    for (uint i = 0; i < 16; i++) {
+        texel_weight_data[i] = local_buff[i];
+    }
+    for (uint i = 0; i < 8; i++) {
+#define REVERSE_BYTE(b) ((b * 0x0802U & 0x22110U) | (b * 0x8020U & 0x88440U)) * 0x10101U >> 16
+        uint a = REVERSE_BYTE(texel_weight_data[i]);
+        uint b = REVERSE_BYTE(texel_weight_data[15 - i]);
+#undef REVERSE_BYTE
+        texel_weight_data[i] = uint(bitfieldExtract(b, 0, 8));
+        texel_weight_data[15 - i] = uint(bitfieldExtract(a, 0, 8));
+    }
+    uint clear_byte_start =
+        (GetPackedBitSize(params.size, params.dual_plane, params.max_weight) >> 3) + 1;
+    texel_weight_data[clear_byte_start - 1] =
+        texel_weight_data[clear_byte_start - 1] &
+        uint(
+            ((1 << (GetPackedBitSize(params.size, params.dual_plane, params.max_weight) % 8)) - 1));
+    for (uint i = 0; i < 16 - clear_byte_start; i++) {
+        texel_weight_data[clear_byte_start + i] = uint(0U);
+    }
+    texel_flag = true; // use texel "vector" and bit stream in integer decoding
+    DecodeIntegerSequence(params.max_weight, GetNumWeightValues(params.size, params.dual_plane));
+    uint weights[2][144];
+    UnquantizeTexelWeights(weights, params.dual_plane, params.size);
+    for (uint j = 0; j < block_dims.y; j++) {
+        for (uint i = 0; i < block_dims.x; i++) {
+            uint local_partition = Select2DPartition(partition_index, i, j, num_partitions,
+                                                     (block_dims.y * block_dims.x) < 32);
+            vec4 p;
+            uvec4 C0 = ReplicateByteTo16(endpoints[local_partition][0]);
+            uvec4 C1 = ReplicateByteTo16(endpoints[local_partition][1]);
+            uvec4 plane_vec = uvec4(0);
+            uvec4 weight_vec = uvec4(0);
+            for (uint c = 0; c < 4; c++) {
+                if (params.dual_plane && (((plane_index + 1) & 3) == c)) {
+                    plane_vec[c] = 1;
+                }
+                weight_vec[c] = weights[plane_vec[c]][j * block_dims.x + i];
+            }
+            vec4 Cf = vec4((C0 * (uvec4(64) - weight_vec) + C1 * weight_vec + uvec4(32)) >> 6);
+            p = (Cf / 65535.0);
+            imageStore(dest_image, coord.xy + ivec2(i, j), p.gbar);
+        }
+    }
+}
+
+void main() {
+    uvec3 pos = gl_GlobalInvocationID + origin;
+    pos.x <<= bytes_per_block_log2;
+
+    // Read as soon as possible due to its latency
+    const uint swizzle = SwizzleOffset(pos.xy);
+
+    const uint block_y = pos.y >> GOB_SIZE_Y_SHIFT;
+
+    uint offset = 0;
+    offset += layer * layer_stride;
+    offset += (block_y >> block_height) * block_size;
+    offset += (block_y & block_height_mask) << GOB_SIZE_SHIFT;
+    offset += (pos.x >> GOB_SIZE_X_SHIFT) << x_shift;
+    offset += swizzle;
+
+    const ivec3 invocation_destination = ivec3(gl_GlobalInvocationID + destination);
+    const ivec3 coord = ivec3(invocation_destination * uvec3(block_dims, 1.0));
+    uint block_index =
+        layer * num_image_blocks.x * num_image_blocks.y + pos.y * num_image_blocks.x + pos.x;
+    current_index = 0;
+    bitsread = 0;
+    for (int i = 0; i < 16; i++) {
+        local_buff[i] = ReadTexel(offset + i);
+    }
+    DecompressBlock(coord, block_index);
+}